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https://www.readbyqxmd.com/read/28817797/wrapped-to-adapt-experience-dependent-myelination
#1
REVIEW
Christopher W Mount, Michelle Monje
Activity of the nervous system has long been recognized as a critical modulator of brain structure and function. Influences of experience on the cytoarchitecture and functional connectivity of neurons have been appreciated since the classic work of Hubel and Wiesel (1963; Wiesel and Hubel, 1963a, 1963b). In recent years, a similar structural plasticity has come to light for the myelinated infrastructure of the nervous system. While an innate program of myelin development proceeds independently of nervous system activity, increasing evidence supports a role for activity-dependent, plastic changes in myelin-forming cells that influence myelin structure and neurological function...
August 16, 2017: Neuron
https://www.readbyqxmd.com/read/28817577/detailing-neuroanatomical-development-in-late-childhood-and-early-adolescence-using-noddi
#2
Alyssa Mah, Bryce Geeraert, Catherine Lebel
Diffusion tensor imaging (DTI) studies have provided much evidence of white and subcortical gray matter changes during late childhood and early adolescence that suggest increasing myelination, axon density, and/or fiber coherence. Neurite orientation dispersion and density imaging (NODDI) can be used to further characterize development in white and subcortical grey matter regions in the brain by improving specificity of the MRI signal compared to conventional DTI. We used measures from NODDI and DTI to examine white and subcortical gray matter development in a group of 27 healthy participants aged 8-13 years...
2017: PloS One
https://www.readbyqxmd.com/read/28816396/identification-of-novel-site-specific-alterations-in-the-modification-level-of-myelin-basic-protein-isolated-from-mouse-brain-at-different-ages-using-capillary-electrophoresis-mass-spectrometry
#3
Bettina Sarg, Klaus Faserl, Herbert H Lindner
Myelin basic protein (MBP) is a multifunctional protein involved in maintaining the stability and integrity of the myelin sheath by a variety of interactions with membranes and other proteins. MBP is subjected to extensive post-translational modifications (PTMs) that are known to be crucial for the regulation of these interactions. Here we report capillary electrophoresis-mass spectrometric (CE-MS) analysis for the separation and identification of MBP peptides that incorporate the same PTM at different sites, creating multiple localization variants, and the ability to analyze challenging modifications such as asparagine and glutamine deamidation, isomerization and arginine citrullination...
August 17, 2017: Proteomics
https://www.readbyqxmd.com/read/28815874/white-matter-alterations-associate-with-onset-symptom-dimension-in-obsessive-compulsive-disorder
#4
Irene Bollettini, Mario Gennaro Mazza, Laura Muzzarelli, Sara Dallaspezia, Sara Poletti, Benedetta Vai, Enrico Smeraldi, Francesco Benedetti
AIM: The high heterogeneity of obsessive-compulsive disorder is best described by a multidimensional model involving symptom dimensions. Our study aimed at investigating white matter alterations associated with obsessive-compulsive disorder focusing on the impact of long lasting effect of symptom dimensions assessed at onset of the illness. Furthermore, we investigate white matter alterations associated with this disorder controlling for the impact of medications and for the prevailing current symptom dimension...
August 16, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28811255/cortical-layers-cyto-myelo-receptor-and-synaptic-architecture-in-human-cortical-areas
#5
REVIEW
Nicola Palomero-Gallagher, Karl Zilles
Cortical layers have classically been identified by their distinctive and prevailing cell types and sizes, as well as the packing densities of cell bodies or myelinated fibers. The densities of multiple receptors for classical neurotransmitters also vary across the depth of the cortical ribbon, and thus determine the neurochemical properties of cyto- and myeloarchitectonic layers. However, a systematic comparison of the correlations between these histologically definable layers and the laminar distribution of transmitter receptors is currently lacking...
August 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28810923/the-chemokine-fractalkine-cx3cl1-attenuates-h2o2-induced-demyelination-in-cerebellar-slices
#6
Sinead A O'Sullivan, Kumlesh K Dev
BACKGROUND: Fractalkine/CX3CR1 signalling has been implicated in many neurodegenerative and neurological diseases of the central nervous system (CNS). This signalling pathway plays an important role in regulating reactive oxygen species (ROS), as well as itself being altered in conditions of oxidative stress. Here, we investigated the effects of recombinant fractalkine (rCX3CL1) in models of hydrogen peroxide (H2O2)-induced demyelination and astrocyte toxicity, within organotypic cerebellar slice cultures...
August 15, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28810241/molecular-epidemiology-of-charcot-marie-tooth-disease-in-northern-ostrobothnia-finland-a-population-based-study
#7
Maria Marttila, Laura Kytövuori, Seppo Helisalmi, Mika Kallio, Marjo Laitinen, Mikko Hiltunen, Mikko Kärppä, Kari Majamaa
BACKGROUND: Charcot-Marie-Tooth (CMT) disease is the most common hereditary neuromuscular disorder with a population prevalence of 9.7-82.3/100,000. In this study, we have estimated the prevalence of CMT and its subtypes in Finland and examined the frequency of molecular etiologies. METHODS: A population-based survey included adult patients with peripheral neuropathy from the province of Northern Ostrobothnia, Finland. Secondary causes of peripheral polyneuropathy were excluded and patients with clinical and neurophysiological features pertinent with CMT were included...
August 16, 2017: Neuroepidemiology
https://www.readbyqxmd.com/read/28807492/neuropsychiatric-involvement-in-lupus-is-associated-with-the-nogo-a-ngr1-pathway
#8
Hong-Wei Lei, Jing-Yuan Wang, Qiu-Jie Dang, Fan Yang, Xin Liu, Ji-Hui Zhang, Yang Li
Neuroinflammation- and neurodegeneration-induced nerve injury may represent important components of neuropsychiatric lupus (NPSLE). Myelin-associated neurite outgrowth inhibitor (Nogo)-a and its receptor, NgR1, limit recovery of the adult central nervous system after injury. We detected a soluble Nogo-a product in the cerebral spinal fluid of patients with NPSLE. In a mouse model of lupus, aging was associated with an increase in Nogo-a positive neurons, diminished myelin sheaths, enhanced pro-inflammatory cytokines, and impaired cognition and memory...
July 9, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28806929/myelination-is-delayed-during-postnatal-brain-development-in-the-mdx-mouse-model-of-duchenne-muscular-dystrophy
#9
Azeez Aranmolate, Nathaniel Tse, Holly Colognato
BACKGROUND: In Duchenne muscular dystrophy (DMD), the loss of the dystrophin component of the dystrophin-glycoprotein complex (DGC) compromises plasma membrane integrity in skeletal muscle, resulting in extensive muscle degeneration. In addition, many DMD patients exhibit brain deficits in which the cellular etiology remains poorly understood. We recently found that dystroglycan, a receptor component of the DGC that binds intracellularly to dystrophin, regulates the development of oligodendrocytes, the myelinating glial cells of the brain...
August 14, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28806920/specific-ion-channels-contribute-to-key-elements-of-pathology-during-secondary-degeneration-following-neurotrauma
#10
Ryan L O'Hare Doig, Wissam Chiha, Marcus K Giacci, Nathanael J Yates, Carole A Bartlett, Nicole M Smith, Stuart I Hodgetts, Alan R Harvey, Melinda Fitzgerald
BACKGROUND: Following partial injury to the central nervous system, cells beyond the initial injury site undergo secondary degeneration, exacerbating loss of neurons, compact myelin and function. Changes in Ca(2+) flux are associated with metabolic and structural changes, but it is not yet clear how flux through specific ion channels contributes to the various pathologies. Here, partial optic nerve transection in adult female rats was used to model secondary degeneration. Treatment with combinations of three ion channel inhibitors was used as a tool to investigate which elements of oxidative and structural damage related to long term functional outcomes...
August 14, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28805812/t-bet-dependent-nkp46-innate-lymphoid-cells-regulate-the-onset-of-th17-induced-neuroinflammation
#11
Brandon Kwong, Rejane Rua, Yuanyuan Gao, John Flickinger, Yan Wang, Michael J Kruhlak, Jinfang Zhu, Eric Vivier, Dorian B McGavern, Vanja Lazarevic
The transcription factor T-bet has been associated with increased susceptibility to systemic and organ-specific autoimmunity, but the mechanism by which T-bet expression promotes neuroinflammation remains unknown. In this study, we demonstrate a cardinal role of T-bet-dependent NKp46(+) innate lymphoid cells (ILCs) in the initiation of CD4(+) TH17-mediated neuroinflammation. Loss of T-bet specifically in NKp46(+) ILCs profoundly impaired the ability of myelin-reactive TH17 cells to invade central nervous system (CNS) tissue and protected the mice from autoimmunity...
August 14, 2017: Nature Immunology
https://www.readbyqxmd.com/read/28805746/melanocortins-melanocortin-receptors-and-multiple-sclerosis
#12
REVIEW
Robert P Lisak, Joyce A Benjamins
The melanocortins and their receptors have been extensively investigated for their roles in the hypothalamo-pituitary-adrenal axis, but to a lesser extent in immune cells and in the nervous system outside the hypothalamic axis. This review discusses corticosteroid dependent and independent effects of melanocortins on the peripheral immune system, central nervous system (CNS) effects mediated through neuronal regulation of immune system function, and direct effects on endogenous cells in the CNS. We have focused on the expression and function of melanocortin receptors in oligodendroglia (OL), the myelin producing cells of the CNS, with the goal of identifying new therapeutic approaches to decrease CNS damage in multiple sclerosis as well as to promote repair...
August 14, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28804608/remyelination-improvement-after-neurotrophic-factors-secreting-cells-transplantation-in-rat-spinal-cord-injury
#13
Shahnaz Razavi, Nazem Ghasemi, Mohammad Mardani, Hossein Salehi
OBJECTIVES: Neurotrophic factors secreting cells (NTS-SCs) may be a superior cell source for cell-based therapy in neurodegenerative diseases. NTS-SCs are able to secrete some neurotrophic Such as nerve growth factor and glia-derived neurotrophic factor. Our primary aim was to assess transplantation of neurotrophic factor secreting cells derived from human adipose-derived stem cells (hADSCs) into the damaged spinal cord rats and determine the potential of these cells in remyelination...
April 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28803660/multiple-sclerosis-skin-induced-antigen-specific-immune-tolerance
#14
REVIEW
Paula Wildner, Krzysztof W Selmaj
Multiple sclerosis (MS) is a highly prevalent demyelinating disorder, presumed to be driven by an autoimmune response toward the central nervous system (CNS) components. All currently available treatments modulate the immune system globally and besides the reduction of disease activity, they may also impose considerable disturbances on the immune protective mechanisms. Thus, induction of antigen-specific immune tolerance remains the ultimate goal of MS therapy. Such approach carries promising therapeutic perspectives and, above all, a desirable safety profile...
August 2, 2017: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/28803512/heterogeneous-pathological-processes-account-for-thalamic-degeneration-in-multiple-sclerosis-insights-from-7%C3%A2-t-imaging
#15
Céline Louapre, Sindhuja T Govindarajan, Costanza Giannì, Nancy Madigan, Jacob A Sloane, Constantina A Treaba, Elena Herranz, Revere P Kinkel, Caterina Mainero
BACKGROUND: Thalamic degeneration impacts multiple sclerosis (MS) prognosis. OBJECTIVE: To investigate heterogeneous thalamic pathology, its correlation with white matter (WM), cortical lesions and thickness, and as function of distance from cerebrospinal fluid (CSF). METHODS: In 41 MS subjects and 17 controls, using 3 and 7 T imaging, we tested for (1) differences in thalamic volume and quantitative T2* (q-T2*) (2) globally and (3) within concentric bands originating from the CSF/thalamus interface; (4) the relation between thalamic, cortical, and WM metrics; and (5) the contribution of magnetic resonance imaging (MRI) metrics to clinical scores...
August 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28802862/microrna-21-expression-in-oligodendrocytes-and-correlation-with-low-myelin-mrnas-in-depression-and-alcoholism
#16
José Javier Miguel-Hidalgo, Katherine O Hall, Hannah Bonner, Anna M Roller, Maryam Syed, Casey J Park, Jana P Ball, Marc E Rothenberg, Craig A Stockmeier, Damian G Romero
MiR-21 is a microRNA implicated in cancer, development, and cardiovascular diseases and expressed in the central nervous system (CNS), especially after injury. However, the cellular expression of miR-21 in the adult CNS has not been clearly established either in mice or human subjects, while its alteration in psychiatric disorders is unknown. MiR-21 expression was characterized in reporter mice expressing β-galactosidase (LacZ) under the endogenous miR-21 promoter (miR-21/LacZ). Brain co-localization of miR-21/LacZ with specific neural markers was examined by double immunofluorescence in reporter mice, while extent of immunostaining for myelin basic protein and PDGFRα was determined in miR-21 knockout and wild-type mice...
August 9, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28801358/il-4-il-13-heteroreceptor-influences-th17-cell-conversion-and-sensitivity-to-regulatory-t-cell-suppression-to-restrain-experimental-allergic-encephalomyelitis
#17
Subhasis Barik, Jason S Ellis, Jason A Cascio, Mindy M Miller, Tobechukwu K Ukah, Alexis N Cattin-Roy, Habib Zaghouani
IL-4 and IL-13 have been defined as anti-inflammatory cytokines that can counter myelin-reactive T cells and modulate experimental allergic encephalomyelitis. However, it is not known whether endogenous IL-4 and IL-13 contribute to the maintenance of peripheral tolerance and whether their function is coordinated with T regulatory cells (Tregs). In this study, we used mice in which the common cytokine receptor for IL-4 and IL-13, namely the IL-4Rα/IL-13Rα1 (13R) heteroreceptor (HR), is compromised and determined whether the lack of signaling by endogenous IL-4 and IL-13 through the HR influences the function of effector Th1 and Th17 cells in a Treg-dependent fashion...
August 11, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28801070/methodological-considerations-for-the-temporal-summation-of-second-pain
#18
Nathanial R Eckert, Charles J Vierck, Corey B Simon, Sachell Calderon, Yenisel Cruz-Almeida, Roland Staud, Roger B Fillingim, Joseph L Riley
Temporal summation of second pain (TSSP) is a psychophysical indication of a central pain encoding mechanism, potentially enhanced in pathological pain conditions. Low frequency repetitive stimulation of unmyelinated (C) nociceptors results in a progressive increase of pain intensity when thermal stimulation intensity remains constant. However, when using different methods of nociceptive delivery to the skin, both regularity and rate of pain enhancement with repetition varies between experiments. Specifically, repetitive ramping up and down from a neutral to a painful temperature has produced weak and inconsistent pain summation...
August 8, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28798954/acute-effect-of-pore-forming-clostridium-perfringens-%C3%AE%C2%B5-toxin-on-compound-action-potentials-of-optic-nerve-of-mouse
#19
Mercè Cases, Artur Llobet, Beatrice Terni, Inmaculada Gómez de Aranda, Marta Blanch, Briain Doohan, Alexander Revill, Angus M Brown, Juan Blasi, Carles Solsona
ε-Toxin is a pore forming toxin produced by Clostridium perfringens types B and D. It is synthesized as a less active prototoxin form that becomes fully active upon proteolytic activation. The toxin produces highly lethal enterotoxaemia in ruminants, has the ability to cross the blood-brain barrier (BBB) and specifically binds to myelinated fibers. We discovered that the toxin induced a release of ATP from isolated mice optic nerves, which are composed of myelinated fibers that are extended from the central nervous system...
July 2017: ENeuro
https://www.readbyqxmd.com/read/28798775/maintenance-of-a-schwann-like-phenotype-in-differentiated-adipose-derived-stem-cells-requires-the-synergistic-action-of-multiple-growth-factors
#20
Alice E Mortimer, Alessandro Faroni, Mahmut A Kilic, Adam J Reid
Differentiating human adipose-derived stem cells (ASCs) towards Schwann cells produces an unstable phenotype when stimulating factors are withdrawn. Here, we set out to examine the role of glial growth factor 2 (GGF-2) in the maintenance of Schwann-like cells. Following ASC differentiation to Schwann-like cells, stimulating factors were withdrawn such that cells either remained in media supplemented with all stimulating factors, GGF-2 alone, or underwent complete withdrawal of all factors. Furthermore, each stimulating factor was also removed from the growth medium individually...
2017: Stem Cells International
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